Move these four symmetrical faces as the image shows. Remember to use Face Finder > Symmetrical to select the symmetrical faces. Move them 10mm in the direction the arrow indicates.

 Change the angle of the face around the vector shown on the illustration above. Move it 5 degrees inwards. Remember to select the symmetrical face as well.

Change the diameter of this face to 200mm. Remember to also select the symmetrical face.

Choose the tool Edit Section, and enter the XZ-plane. Also activate Section View.

 Move the top line downwards and the bottom line a bit upwards, as the illustration above.

Add a FIX-constraint to the curve as shown above

Make the fixed line parallel to the line next to it.

 Make these two lines parallel as well.

 Add an angle of 132 degrees between these two lines.

Choose the tool Perpendicular Dimension, and add a value of 10mm between these two lines.

 Choose Horizontal Dimension, and add a value of 240mm between these two lines.

Choose Finish Sketch after this operations. You can also deactivate Section View.

Add a linear dimension where you use the YZ-plane as Origin Object.

 Use the x-axis as Orientation.

Use the edge as illustrated above as Measurement Object.

 Make sure the following faces are chosen in Face to Move, and add a length of -500.

 Change the angle of the following faces where you add a value of 120 degrees. Make sure you also select the symmetrical face.

 Use Insert > Trim > Divide Face and divide these two selected faces across the XY-plane.

Make the following face parallel with the symmetrical face. Make sure you use Face Finder to include the symmetrical face.

For the Through Point, select the point as shown above.

 Wrap up the exercise by using the same method for the face below